脉冲

In order to solve the problems of bad shunting and red light strip phenomenon at electric railway section caused by the defective of asymmetric pulse track circuit receiver formerly, a new type of asymmetric impulse track circuit receiver is designed. It takes the PIC16F887 single-chip microcomputer as central processing unit of the system, realizes processing and judging the asymmetric impulse from the track transformer automatically. The article focused on the receiver work flow, hardware circuit and software design.

摘 要：为了解决以往多数不对称脉冲轨道电路接收器存在缺陷而导致的分路不良问题和电气化区段空闲&红光带&现象，设计了一种新型脉冲轨道电路接收器，系统以PIC16F887单片机为核心处理单元，自动实现对由轨道变压器传来的不对称脉冲信号进行处理和判决，重点讨论了接收器工作流程、硬件电路实现以及软件设计。

Our main products include: LFEF shaft fiberglass bag filter; FMPD sub-room-type pulse jet bag filter; MDC coal mill baghouse; LFMD series of vertical kiln baghouse; HMC single-pulse dust collector series; FD-, FVB type, CXBC type, YMW type, ZC-ó type rotary anti-hair bag filter; HD Series, UF series, BD series of stand-alone dust collector; MC-type BAG Pulse dust collector; NMB inverse baghouse airflow; PDC-ò type check beside the flat bag filter; CKC, XSSH series of electrostatic precipitators; CCJ / C filter impulse; various types of cyclone dust collector.

我公司生产的主要产品有：LFEF立窑玻纤袋除尘器；FMPD型分室脉冲喷吹袋式除尘器；MDC型煤磨袋式除尘器；LFMD系列立窑袋式除尘器；HMC单机脉冲系列除尘器；FD—、FVB型、CXBC型、YMW型、ZC—Ⅲ型回转反吹风袋式除尘器；HD系列、UF系列、BD系列单机除尘器；MC型袋式脉冲除尘器；NMB逆气流袋式除尘器；PDC—Ⅱ型旁查扁袋除尘器；CKC、XSSH系列静电除尘器；CCJ/C冲激式除尘器；各类旋风除尘器。

The fiber laser with R=10% and Er3+-doped fiberlength of 3 m was experimentally carried out, with the repitition rates of 15.87 MHz, spectrum width of 25.4nm and single pulse energy of 0.52nJ, which wouldn't be impacted by librations of desk, movement of fiber laser or temperature variation.

取3 m长的增益光纤和R=10%的激光器，获得了重复频率15.87 MHz，谱宽25.4 nm，单脉冲能量约0.52 nJ的脉冲激光，这些特性不会受到工作台振动、激光器搬动及普通温度变化等因素的影响，脉冲幅值存在约4%的波动。

It is a kind of electromagnetic mechanical device turning dispersed electric pulse signal into corresponding angle displacement or line displacement to Electric motor which by stepwise, it is one introduction that output pulse corresponding increment drive component.

步进电动机是一种将离散的电脉冲信号转化为相应角位移或线位移的电磁机械装置，它输出的角位移与输入的脉冲数成正比，是一种输入与输出脉冲对应的增量驱动元件。

Station communications subsystem battery discharge due to the long-off and other reasons to enable to shorten battery life or near end-of-life issues, the charger using electronic sweep pulse technology, uninterrupted electricity to issue a specific pulse frequency, the use of momentary high-current activation "ill "battery plate, electric pulse so that re-crystallization of lead sulfate crystals into a small, highly reversible electrochemical activity of lead sulfate to be able to participate in the normal charging and discharging of the electrochemical reaction, so that waste batteries back to life, back to and new battery is almost the same capacity, the same time, greatly extended battery life.

针对通信机站子系统蓄电池因长期过放电等原因使蓄电池寿命缩短或接近报废的问题，该充电机采用电子扫频脉冲技术，不间断地发出特定频率电脉冲波，利用瞬间大电流激活&生病&的电池极板，电脉冲波使硫酸铅结晶重新转化为晶体细小、电化学活性高的可逆硫酸铅，使其能够正常地参与充放电的电化学反应，使废旧的蓄电池起死回生，恢复到与新电池几乎一样的容量，同时大大延长了电池使用寿命。

In order to satisfy the equipment of physical experiment, it developed beam pulse technology research on ns-200 accelerator. It uses sine-wave beam adjustment pipe focused beam match design research beam pulse system、high frequency power supply system, pulse measure system and distance auto-control system.

在ns-200中子发生器上开展了束流脉冲化技术研究工作，采用正弦波速调管聚束方法设计了束流脉冲化系统，研制了高频电源系统、脉冲测量系统和远程自动控制系统。

Based on Stuart et al.'s electron density evolution equation, the electron density evolution process in fused silica film irradiated by short-pulse laser for τ∈[0.015] ps were studied by means of numerical method. The effects of initial electron density N and laser pulse width τ on laser threshold intensity I and damage threshold fluence. F were analyzed respectively.

基于STUART等人的电子密度演化方程，运用数值模拟方法，研究了脉宽为τ∈[0.01， 5]ps范围内单脉冲激光作用下熔融石英薄膜中电子密度演化过程；讨论了初始电子密度、激光脉冲宽度对阈值功率密度和阈值能量的影响；分析了初始电子密度、激光脉冲宽度对多光子离化及雪崩离化的影响。

With the propagation of the input negative-falltime pulse along the transmission line, the capacitance of varactor diodes is decreased by the increase of reverse bias voltage, and the variation in propagation delay at the nodes results in the compression of negative-going wavefronts during propagation.

随着输入脉冲在传输线上的传播，变容二极管的电容随反偏压增大而减小，导致每个节点传播延迟的变化，从而压缩脉冲波前，产生前沿可达1ps的超快脉冲。

The definition of generator angle is proposed in this paper. A new method to deduce generator angle by using rotor rotation signal is illustrated, which compares the phase difference between GPS timing pulse and RRS. Using only mechanical signal, the technique unfreezes limitation of zero-cross of generator terminal voltage during transient process. Automatic correction of initial generator angle is also proposed .

本文介绍了同步发电机绝对转子角的定义，提出了一种测量绝对转子角，进而获得高精度的相对转子角的方法；此方法不使用机端电压过零整形脉冲，而是将机组键相脉冲与GPS 定时脉冲比相，并能够自动整定初始位置角，因此，测量结果不受发电机运行状态的影响，能够在各种运行方式和扰动情况下获取高精度的绝对转子角。

A new type of nanosecond high voltage pulse generator is designed with oscillation circuit .

分析各种窄脉冲产生方法后用振荡电路原理研制了一种新型ns级高压窄脉冲发生器，可输出脉宽20～100ns、幅值500～1000V的可调ns级脉冲电压。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。